What is the purpose of a syphon in a domestic drainage system

Asked Feb 13, 2010, 08:49 AM
—
2 Answers

The drain from my house to the main drain was blocked recently. A drainage company carried out a sonar trace to find the buried syphon, excavated the area around it and unblocked it using a high pressure water jet to clear a 6" foul line and restored flow. They are recommending that the syphon trap be excavated and removed in order to carry out a CCTV survey and then to install new pipework including bringing the rodding access to surface level. What does all this mean? Is what they are recommending a good idea? What does it all mean? Help!

They are recommending that the syphon trap be excavated and removed in order to carry out a CCTV survey and then to install new pipework including bringing the rodding access to surface level. What does all this mean?

Never heard of a "siphon trap" on a sewer line. Could it be that they mean a "running Trap",(see image?)

bringing the rodding access to surface level.

All this means is that they will bring the sewer clean out to ground level.
Installing new pipe work translates to big bucks out of your pocket.
This company throws around a lot of big words. As a rule this is to confuse the home owner into signing for work he really doesn't need.
Unless there's a break in the pipe I can see no reason to replace it all.
I'm just a little leery about this company. My advice ?
Get another estimate and compare.
Good luck, Tom

Add your answer here.

Check out some similar questions!

When we run the washer upstairs and/or drain the bathbu when full it will cause a bubbling up in the toilet downstairs and a backflow in the bathtub and toilet downstairs. We have only seen the toilet backflow once. If we wait it drains eventually. In fact in the kitchen sink downstairs water...

Hello all,
I am buying a 1921 Bungalow in a week or so and one of my first projects will be to reroute the drainage for all the downspouts. They current drain into a 4" clay tile system that then comes through my basement wall and connects to the city sewer.
I know this is a big no-no, but it...

Hi,
I'm designing a club in which I'm designing a gym in the basement with sauna bath &massage tub, so anyone can help me & suggest me sump/drainage system detail for the basementor can send me the related data.
Thanking u
Waiting 4 early response
vinniupmanu